EraVerdict: Two very different S4s share a badge. B5 cars need timing-belt and turbo honesty; B6 4.2 cars need timing-chain guide proof — price the chain job into any undocumented example.
At a glance
Risk 4/5 Market: B5 = turbos; B6 = chains
Must-have records:
- B5: timing belt within interval
- B6: timing chain / guide service invoice
- Tiptronic service history if equipped
- Cooling-system refresh
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Buy-risk rundown
| Issue | Symptom | How to check | Typical cost (as of Nov 2026) |
|---|---|---|---|
| B5 timing belt (interference 2.7T) | None until failure | Demand ≤8 yr / ~80k mi service proof | Cost not yet verified on this page [1] |
| B5 Tiptronic torque-converter / drum issues | Slip, harsh/delayed shifts, reverse problems | Long warm test drive; scan | Not yet verified [2] |
| B6 4.2 timing-chain guides / tensioners | Cold-start rattle; worst case jumped timing | Listen cold; demand chain-service invoice | Specialist chain service commonly ~$6,000–$9,000 [3][4] |
| Oil leaks / consumption | Wet covers, low level | Visual + dipstick | Not yet verified |
| Suspension bushings / rust | Wander, clunks, soft arches | Lift inspection | Not yet verified |
Cost figures checked against the sources below in Nov 2026. Bracketed numbers refer to the source list.
Notes
- B5 (2000–02 US) biturbo and B6 (2004–05) 4.2 are not interchangeable checklists — verify chassis.
- Manual B5/B6 cars avoid Tiptronic drama but still need the engine checks.
Before you buy
Use our printable pre-purchase inspection checklist and get a PPI from a marque specialist.
Sources
- Hagerty, 2000–02 S4 buyer's guide (accessed Nov 2026)
- Audi Revolution, Tiptronic information thread (accessed Nov 2026)
- Audizine, B6 S4 timing service cost thread (accessed Nov 2026)
- Autocar, S4 B6/B7 used buying guide (accessed Nov 2026)
Last updated 2026-11-05. Costs vary by region and shop.
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